<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
	   #div1{
			color: red;
		}	
		#div2{
			letter-spacing: 5px;
			
			
		}
		#div3{
			text-align: center;
			line-height: 100px;/* 行高等于容器高度,单行文本垂直居中 */
		}
		#div4{
			text-align: 2em;/* em代表字符宽度 */
		}
		#div5{
			text-align: center;
		}
		</style>
	</head>
	<body>
		<div id="div1">这是helloworld</div>
		<div id="div2">这是helloworld</div>
		<div id="div3" class="con" style="border:1px solid black; width:200px; height:100px">这是helloworld</div>
		
		<div id="div4">这是helloworld</div>
		<div id="div5">这是helloworld</div>
	</body>
</html>
